We start with a top quality HAZET socket, Made in Germany, and turn down the outside diameter of the socket so that it will fit inside the recess in the frame and allow access to the swingarm pivot locknuts on /5 and /6 models.
/5 and /6 frames have a small opening and most socket won't quite fit inside. Therefore this modification to the tool is necessary. On subsequent models, the opening in the frame was enlarged. Of course, this socket will alo work perfectly on all later models plus K75, K100 and K1100 models.